There's a video by Scotty Kilmer on Youtube in which he pours a gallon of lacquer thinner in 1/2 tank of gas to clean the converter. He says in about 150 miles the converter should be cleaned and not produce any trouble codes. I'd be concerned that the lacquer thinner might attack plastic parts in the fuel tank, but he says he hasn't had any problems doing it this way. Try it out and let us know how it works.

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